Tpiomas e



T. E. HuN'T.

Grinding Mill.

Patented Jan'y 3, 1860.v

m'zneases: /OC-zz.

UNITED sTA'rEs PATENT OFFICE.

THOMAS E. HUNT, OF LOUISVILLE, KENTUCKY, ASSIGNOR TO HUNT, BRAW'NER & CO., OF di SAME PLACE.

GRINDING-MILL.

Specification of Letters Patent No. 26,738, dated January 3, 1860.

To all 'whom it may concern:

Be it known that I, THoMAs E. HUNT, of Louisville, in the county of Jefferson and State of Kentucky, have invented a new and useful Improvement in Grinding-Mills; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making part of this specification.

The nature of my invention relates to the combination of two annular spring cushions and their arrangement with reference to the revolving upper portion of the mill so as to give it an elastic or yielding action in relation to the stationary part and also obviate the necessity of close or accurate fitting, substantially as hereinafter represented and described.

Iith reference to the accompanying drawings Figure 1 is a perspective view of a mill in which my improvement is introduced. Fig. 2, is a sectional view, the plane of section passing centrally through the mill. i

A, is the stationary lower part of the mill,

and rests upon the legs B, its upper conveX surface being provided with the teeth C, on its upper portion and the usual furrows and cutting or grinding edges nearer the bottom.

D, is the upper and revolving portion of the mill and has attached to it the hopper rim E, into which the material is thrown to be ground. A central hub F, is connected to the part D, by the arms F1. On these arms are arranged teeth G, which alternate among the teeth C, for breaking up the coarser matter, to be ground more perfectly between the surfaces near the bottom.

On the top and at the center of part A, is cast or otherwise secured the hub A1 and in the hub F, is made a corresponding cavity, though considerably deeper. Upward through both hubs Al and F, passes a square bolt H, secured so as not to turn in the stationary base A, but passing loosely through a round hole in hub F. In the cavity of hub F, is arranged a washer or Circular bearing piece I, fitted to the square bolt H,

so as not to turn but by it to be kept from revolving. Between this bea-ring piece I, and the top of hub Al, is arranged the annular caoutchouc or manufactured rubber spring or cushion J. This rubber spring by reason of its elasticity provides for a proper adjustment of part D, with reference, or in relation to, part A, by means of nut K, and without the necessity of accurate fitting which would otherwise be required.

A hub L, is fitted with a square socket to the shaft H, and on this stationary hub are fixed the knives M, so as to cut or break up any coarse substance which may fall between but not below the arms F1. The hub L, rests upon hub F, and upon its top end, and between it and a washer N, is arranged another rubber spring or cushion o, similar to J, the washer N, being fitted with a square hole to the square shaft H, so as not to be turned thereon by the friction of nut K, when turned upon it.

By the combined action of the two india rubber springs J, O, the action of the upper revolving part D, of the mill is made of a yielding or elastic nature with reference, or in relation to, the lower stationary part whereby a better efiect is secured in the performance of the mill than when it is constructed in the usual manner.

Besides the community of action arising from the two rubber springs together on the grinding surfaces, there is a separate action of the spring (o, 0,) on the cutting blades M, relieving the said blades in case of any rigid obstruction coming between them and the grinding part below. In which case the spring (0, 0,) yields or allows the blades to rise, without any corresponding action in the springs (J, J which being inclosed in a close box under the colicave (F') are out of the reach of injury and operate only on the grinding surfaces of the mill. Springs (0, 0,) on the contrary, combine their action with (J, J,) when the grinding surfaces of the mill are affected, and have an individual and separate action when the blades are obstructed.

The material for the construction of those parts not hereinbefore specified may be,

cast or Wrought iron, or other material commonly used for like purposes.

Having` described the construction and operation of my improvement What I claim 5 therein as new and desire to secure by Letters Patent is as follows:

I claim the combination of springsV (o, 0,) with the cutting blades (M) in the manner In testimony of Which invention I have hereunto set my hand.

THOMAS E. HUNT. Witnesses H. E. CLIFTON, CHARLES L. FISHER. 

